TEHRAN, Iran (CNN) -- Iran denied a report that several of its boats taunted a U.S. Navy vessel in the Persian Gulf on Thursday night, according to IRNA, Iran's official news agency.

A U.S. military official told CNN Friday that the USS Typhoon, a small patrol craft, was approached by three small Iranian boats in a "taunting manner."

"There has been no confrontation between Iranian boats and the U.S. [Fifth] Fleet," IRNA quoted an unnamed Iranian source as saying.

The U.S. military source said U.S. Navy officers conducted bridge-to-bridge communications with the Iranian boats and two of them then turned away. But one came within 200 yards of the Typhoon, prompting it to fire a warning flare. The Iranian boat then turned away.